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Significant Accounting Policies and Consolidated Financial Statement Components Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Threshold period past due for Non-Accrual of Finance Receivable	90 days
Point-of-Sale [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding	11,432,000	7,350,000
Financing Receivable, Modifications, Recorded Investment	$ 17,169	$ 10,346
Financing Receivable, Carrying Value, Nonaccrual Status	4,247	2,432
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Performing	2,368	1,279
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Nonperforming	$ 1,879	$ 1,153
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,720,000	1,645,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,675	$ 1,681
Point-of-Sale [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding	915,000	560,000
Financing Receivable, Modifications, Recorded Investment	$ 1,570	$ 865
Direct-to-Consumer [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding	6,681,000	1,449,000
Financing Receivable, Modifications, Recorded Investment	$ 7,067	$ 4,728
Financing Receivable, Carrying Value, Nonaccrual Status	1,173	474
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Performing	508	279
Financing Receivable, Modification, Carrying Value, Nonaccrual Status, Nonperforming	$ 666	$ 195
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	870,000	381,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 2,466	$ 1,149
Direct-to-Consumer [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Number Of Contracts Outstanding	80,000	9,000
Financing Receivable, Modifications, Recorded Investment	$ 86	$ 10

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
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-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 34
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